通过挂钩添加onclick到Woocommerce按钮

I need to add an onclick to a WooCommerce button, but I do not find the file responsible for this button.

Could this be done by hooks?

Currently my button looks like this:

<button type="submit" class="button alt" name="woocommerce_checkout_place_order" id="place_order" value="Finalizar compra" data-value="Finalizar compra">Finalizar compra</button>

I wish it would look like this:

<button type="submit" class="button alt" name="woocommerce_checkout_place_order" id="place_order" value="Finalizar compra" data-value="Finalizar compra" onclick="javascript:document.MyForm.b1.value='Done'">Finalizar compra</button>

Is it possible to do via hook? Since the file would be superimposed on a Woocommerce update.

Thanks!